How do inequalities arise, and how are they interconnected? Pierre Volovitch explains how inequalities accumulate and “form a system,” whether they pertain to income, educational opportunities, housing, or health status. When it comes to social inequalities in health, they result from a combination of adverse factors (unemployment, financial difficulties, housing problems, and social isolation). A study by IRDES shows that social vulnerability significantly increases the likelihood of poor health. But the complexity of how these inequalities are interconnected must not be used as an excuse for inaction: a policy to reduce inequities cannot remain sector-specific.